#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int main()
{
	int n = 0;
	scanf("%d", &n);
	int a = 2;
	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		sum += a;
		a = a * 10 + 2;
	}
	printf("%d", sum);
	return 0;
}